Display device

Abstract

A circuit section of a display device is provided with a display element section on which a plurality of display elements are arranged at positions overlapped with a display region on which a display functional layer is formed, an input section for transmitting a signal for driving the display functional layer to the display element section and a lead-out wiring section for electrically connecting the display element section to the input section. Moreover, the lead-out wiring section is provided with a plurality of stacked wiring layers, and the plurality of wiring layers include a first wiring layer on which a plurality of first wirings having a first wiring width and a second wiring layer on which a plurality of second wirings having a first wiring width that is narrower than the first wiring width are formed.

What is claimed is: 
     
       1. A display device comprising:
 a substrate having a first surface; 
 the first surface has a display region having a plurality of pixels, an input section to which a signal to be supplied to the pixels is input, and a lead-out wiring section for electrically connecting the display region to the input section, 
 the substrate has a first side extending along a first direction, a second side positioned on the opposite side of the first side, a third side extending along a second direction that is orthogonal to the first direction and a fourth side positioned on the opposite side of the third side, 
 the input section and the lead-out wiring section are formed between the first side and the display region, and 
 wherein 
 the lead-out wiring section includes a first wiring layer having a plurality of first wirings, a second wiring layer having a plurality of second wirings, a third wiring layer having a plurality of third wirings, a first insulating layer is formed between the first wiring layer and the second wiring layer, a second insulating layer formed on a side opposite to a first surface of the second wiring layer, and a second insulating film is formed between the second wiring layer and the third wiring layer, and 
 the first wiring, the second wiring, and the third wiring are disposed parallel to each other in the lead-out wiring section. 
 
     
     
       2. The display device according to  claim 1 , wherein the first insulating layer is made of an inorganic material and the second insulating layer is made of an organic insulating layer. 
     
     
       3. The display device according to  claim 1 , wherein in the lead-out wiring section,
 an opening is formed in the first insulating film, the first wiring layer and the second wiring layer are electrically connected via the opening, the organic insulating film is formed on the opening. 
 
     
     
       4. The display device according to  claim 1 , wherein a line width of the first line is wider than a line width of the second line in plan view. 
     
     
       5. The display device according to  claim 1 , wherein each of the plurality of pixels of the display region having a transistor having a gate electrode, and
 the first wiring layer is formed on the same layer as the gate electrode. 
 
     
     
       6. The display device according to  claim 1 , wherein the plurality of first wirings and the plurality of second wirings are formed of metal materials of mutually different kinds. 
     
     
       7. The display device according to  claim 1 , wherein the plurality of third wirings are arranged between the second wirings in a plan view. 
     
     
       8. The display device according to  claim 1 , wherein the plurality of second wirings and the plurality of third wirings are not overlapped with each other, and the plurality of third wirings are overlapped with the plurality of first wirings in a plan view. 
     
     
       9. The display device according to  claim 1 , wherein an opening is formed in the second insulating film on the lead-out wiring section, and the second wiring layer and the third wiring layer are electrically connected via the opening. 
     
     
       10. The display device according to  claim 4 , wherein a distance between the first wirings is wider than a distance between the second wirings.